wayland: Implement xx-pip-v1

Vlad Zahorodniirequested to merge
work/zzag/xdg-pip-v1 into master

The xx-pip-v1 protocol provides clients a way to create floating windows with miniature contents, for example a video (a movie or a video call), a map with directions, a timer countdown, etc.

These windows are placed in the overlay layer above all windows, including fullscreen windows.

This is an experimental version of the protocol.

Edited by Vlad Zahorodnii

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